Can filter driver ignore an AddDevice?
in [Device Drivers]
|
Prev: How to modify packet content at list of NET_BUFFER structures at N
Next: Vista Unsigned Driver Issue
From: Ilya Konstantinov on 18 Nov 2009 11:24 Hello, I have a question. If my filter driver elects not to filter a certain PDO (e.g. it retrieves some PDO property through IoGetDeviceProperty and figures out the device should not be filtered), what should it do? 1) Return STATUS_UNSUCCESSFUL, or 2) Simply return STATUS_SUCCESSFUL before doing any IoCreateDevice And anyway, is it legit to call IoGetDeviceProperty on the PhysicalDeviceObject at this point? Thanks.
From: Don Burn on 18 Nov 2009 11:37 Just return STATUS_SUCCESS but do not attach to the device stack. If you return a failure code the whole device stack will be torn down. -- Don Burn (MVP, Windows DKD) Windows Filesystem and Driver Consulting Website: http://www.windrvr.com Blog: http://msmvps.com/blogs/WinDrvr Remove StopSpam to reply "Ilya Konstantinov" <ilya.konstantinov(a)gmail.com> wrote in message news:a26c0832-07ce-4550-af9a-77adbffe9f17(a)a31g2000yqn.googlegroups.com... > Hello, > I have a question. > > If my filter driver elects not to filter a certain PDO (e.g. it > retrieves some PDO property through IoGetDeviceProperty and figures > out the device should not be filtered), what should it do? > 1) Return STATUS_UNSUCCESSFUL, or > 2) Simply return STATUS_SUCCESSFUL before doing any IoCreateDevice > > And anyway, is it legit to call IoGetDeviceProperty on the > PhysicalDeviceObject at this point? > > Thanks. > > __________ Information from ESET NOD32 Antivirus, version of virus > signature database 4618 (20091118) __________ > > The message was checked by ESET NOD32 Antivirus. > > http://www.eset.com > > > __________ Information from ESET NOD32 Antivirus, version of virus signature database 4618 (20091118) __________ The message was checked by ESET NOD32 Antivirus. http://www.eset.com
From: Scott Noone on 18 Nov 2009 11:43
> If my filter driver elects not to filter a certain PDO (e.g. it > retrieves some PDO property through IoGetDeviceProperty and figures > out the device should not be filtered), what should it do? Just return STATUS_SUCCESS. If you return a failure value then you're going to prevent the device stack from being built. > And anyway, is it legit to call IoGetDeviceProperty on the > PhysicalDeviceObject at this point? Absolutely. -scott -- Scott Noone Consulting Associate OSR Open Systems Resources, Inc. http://www.osronline.com "Ilya Konstantinov" <ilya.konstantinov(a)gmail.com> wrote in message news:a26c0832-07ce-4550-af9a-77adbffe9f17(a)a31g2000yqn.googlegroups.com... > Hello, > I have a question. > > If my filter driver elects not to filter a certain PDO (e.g. it > retrieves some PDO property through IoGetDeviceProperty and figures > out the device should not be filtered), what should it do? > 1) Return STATUS_UNSUCCESSFUL, or > 2) Simply return STATUS_SUCCESSFUL before doing any IoCreateDevice > > And anyway, is it legit to call IoGetDeviceProperty on the > PhysicalDeviceObject at this point? > > Thanks. |